I was able to locate the weapons package, but the majority of what you are looking for is not in there.
However, and this is the odd part...the weapons .bgl file for Canion's aircraft is almost 100kb, and it includes textures for the two gun weapons. And if you read the .dp files, the gunstations have the weapons data, and it substitutes for a .dp file. How he did that is beyond my knowledge, but it works.
I have attached the 50kg bomb, but I don't have the 250kg. Maybe someone else has the other .dp files, and if they do, I can update the package in the library.